Lifting jack for automobiles



Patented Aug. 3, 192e.

PATENT OFFICE.

ANDREW J. PERKINS `ANI) LESTER PERKINS, `GF CHICAGO, ILLINOIS, ASSIGNORS TO YELLOW JACK-IT MANUFACTURING COIIANY, VA CORPORATION OF ILLINOIS.

YVLIFTINGv JACK FOR AUTOMOBILES.

Application filed July 2,

This invention relates'to lifting jacks and more particularly to portable'jaclzs designed for use in connection with `the lifting of automobiles and other heavy vehicles.

One 'of the 4objects of the present invention is toprovide an improved portable j ack so constructed that the same can 'be quickly adjusted to the pro-per height of the axle of the vehicle without any great effort on the part of the operator. y

A. i'urther object of `the invention is to provide a simple and economical frame construction oi a lifting jack which can be quickly and lreadily assembled.

'further object of the invention is to provide an easily manipulated foot lever Vmechanism within easy reach ofthe operator ifor raising and lowering the extensible member.

A still further object oi 'the invention is to provide lever mechanism adr-.pledr to col-operate in connection with a gravity ac- Vtuated pawl which loclrs the extensible member in predetermined positions of adjustment. y

These and other objects are obtainedby providing ay construction and arrangement oit the variousvparts in the manner hereinal'ter described and Vparticularly pointedont inthe appended claims.

@ne embodiment olf the invention. is illustrated in the accompanying drawings and in these drawings Fig. 1 is Vatop Vvplan view of the lifting jack showing our improvement embodied therein. 1

Figi). is a side elevational view-'showing `the `manner in which our improved 'foot lever mechanism operatesfthe gravity actuated pawl for adjusting the extensible member.

'F 3 is a sideelevationalview of the lifting jacky on the side opposite-to that shown in "Fig: @and shows the foot lever mechanism for lifting lthe extensible'member.

Fig. 4 is a crosssectional view oi the liftingmember showing the manner in which the gravity actuated pawlVmechanism is adapted `to e igage the extensible member in locking the same' in various positions of adjust-menhrand Fig. "-5 is a cross sectional view taken on 'the'lines-in Fig. -1 sho-wing the manner 1923. Serial No. 648,885.

in'which the guide members secured to the ootlever mechanism engage the longitudithe rear end of the longitudinalmain frame' members 10 at the/outer sides thereof' are two angular members "14. Secured to the angle members 1li-by means lof the U bolts is an axle 16. Botatably mounted onthe aule lare the usual carrying` truclrwheels 17 held in position by thefusuallwashers and cot-ter pins 18. f/rdjustably mounted adjacent the truck carrying wheels 17 an`d`between the guide plates 19 secured to the inner sides of the longitudinal frame meinbers 10 is the'usual lifting member 20, The liitingmember 9.() is provided with two rollers 21 jo-urnalled on the'lower end thereof which engage. with the flexible member 22 in a manner `to `be adjusted'therebybetween the guide meml es 19. The rear end oi the flexible member 22'extends beneathl the rollers 21 and has its rear end'thereoi' connectedto the main frame, not'shown, while the `io'rward portion of the-flexible member QQ entends upwardly as shown at 23 and passes over a roller 24 journalled on a bolt'Q/ secured to the main Vi-ramemembers 10. The

'orvvard end of theiiexible memberi `is and the pawl'29`is actu-ated lto'lock the 'drum invarious positions of adjustment.l The winding drum 271s actuated'by a levell 31 pivoted on a shaft 32. 'The-shaft 32 is- Journailed on the rforward ends ofthe main trame members 10 and also forms an axis Alo'r the windingydining?. The lever v31 is-provided with a pawl 33 pivoted at 34 and adapted to engageA the ratchet wheel 28. Both the pawls 29 and 83 are provided with suitable connectionswhich extend up to and arewithin easy reach. of the hand of the operator by means of which either of these pawls may be actuated for disenthe same :trom the ratchet Vwheel 28.

lt will be further understood that spring ac-A tuating means are provided for normally locking or forcing these pawls into engagementl with the ratchet teleth. The construction thus far described forms no part of the present invention and accordingly a more detailed description of the same is not necessary'.

ln connection with our improved tramel theI levers for operatingand adjusting the extensible member. This construction comprises two caster brackets 35 secured to the outer sides ot' the frame members l0 and provide-dewith. caster wheels and supports 36. Positioned between the main 'frame members l and in transverse alignment with the caster brackets is a spacer n'iemb-er 37. The spacer member 37 together with the caster brackets 35 are provided with regis tering apertures rwhich extend through the main frame l0. Through these apertures the bolts 38 and 39 extend for securing the cast-er brackets 35 as well as the spacer me-mber Stogether. rIhe bolt 38 extends through o-ne ot the brackets 35 in a manner to form 'a pivotal bearing for the foot lever 40l as shown at 4l. The foot lever 40 extends rearwardlysand is twisted in a manner to present its fiat side in the form oa foot treadle as shown at 42 by means of which the lever is actuated. The lever is bent around the caster bracket 35 as shown at 43 and is then bent at 44 where it extends along parallel with the ina-in frame 10. rhe free end ot the lever 40 is adapted to engage the extensible mem-ber in the manner hereinafter described.V i i Y Positioned on the side opposite the lever 40 is a second` lever 45` which is pivoted at 46 to an extensionv of the b0lt89. The lever 45 is formed Lin a manner similar to the lever40 in that it conforms to theshape of the side of the. jack,and the rrearward end of the'same is formed `parallel to the main frame .mem-ber 1G. The forward end of the lever 45 is provided with a Jfoot treadlel portion 47,iwhile the rear end ofthe leveris provided with a horizontally disposed iat portion 48twisted at right angles with respect to the body portion of the leverand is adapted to engage the gravity actuated paw] in the manner hereinafterdescribed. Each of the levers 40 and 45 are provided thereof yas shown at 55.

with guiding members 49 secured by means et bolts 50. These guiding members are sccured to the outer sides of these levers and extend upwardly in the form` of a'loop and extend over and downwardly as shown at form, which is adapted to engage. the axle ci' 'the vehicle. The extensible member is'provided Ywith a laterally extending lug 54 havingan enlarged head on the outer end The lug 54 is adapted to be engaged by he .lever 40 when the extensible member 52 is adjusted by the operator when the foot. treadle portion 4Q of the lever40 is depressed. rrlhe exten-4 sible member1 52 is further provided with a pluralityof ratchet teeth 56 formed on the rear side thereof, which in turn are adapted to be engaged byfa gravity actuated pawl 57. The pawl-.57is pivotally mounted in a socket 58 termed by a bracket 59 secured to a lug 60 oft the lifting member 20. The

pan'l 5'( is provided with a .normally vertical shank portion 6l which extends into the socket and is held from displacement there` in by two horizontally disposed bolts or pins 62.k The gravity pawl is actuated or pressed into engagement with the ratchet teeth 56 of the extensible member 52 by a weighted arm extending laterally from the pawl at 63 and having'a forwardly extending portion G4 which terminates in al ball or weight G5.

Theball or weight normally actuates the `pawl into engagement with the `teeth and is positioned over the horizontallyx dispo-sed flat portion 48 of the lever 45 in a manner to be engaged or lifted by this portion 4S when the foot treadle 47 of the lever 45 is depressed by the operator to disengage the pawl from the ratchet teeth of the extensible member. *Y v l It will be seen from the above description that a very simple and eiiicient construction ot a lifting jack mechanism foradjusting t the extensible Y member l,has been `provided land one in which the operating levers are positioned on the opposite sides of the j ack within easy reach of the operator where they can be manipulated to adjust the extensible member tovarious positions of adjustment` l What we claim as our invention and desire to vsecure by Letters Patent is l. A lifting jack comprising a frame, a lifting member mounted on saidvframe, an extensible member adjustably mounted on said lifting member, a pawl mounted on said lifting member for engaging and supportingk said extensible member in various positions of adjustment, and a lever pivoted to said frame and engageable with said pawl for disengaging said pawl from said extensible member in all positions of adj ustment of said lifting member.

2. A lifting jack comprising a frame, a lifting member mounted on said frame, an extensible member carried by said -lifting member, a paw'l pivotally mounted on said lifting member and engageable with said extensible member, said pawl having an arm extending forwardly of its'pivot, and a lever pivoted to said frame and engageable with said arm in all positions of adjustment of said lifting member for disen* gaging said pawl from said extensible member.

3. A lifting jack comprising a frame, a lifting member mounted on said frame, an extensible member carried by said lifting member, a pawl pivotally mounted on said lifting member and engageable with said extensible member, a weighted arm formed integrally with said pawl and extending forwardly with respect thereto,` and a lever pivoted to said frame and engageable with the lower side of said pawl for disengaging said pawl from said extensible member.

4t. A lifting jack comprising a frame, a lifting member mounted on said frame, an extensible member carried by said lifting member, ya plurality of teethV formed on the rear side of said extensible member,

a pawl pivoted to said lifting member and,

engagea-ble with the teeth on said extensible member, a weighted arm formed integrally with andV extending laterally and forwardly from said pawl for normally actuating said pawl into engagement, with said teeth, and a lever pivoted to said frame and engageable with said arm for disengaging said pawl from the teeth on said extensible member.

5. A lifting jack comprising a frame, a lifting member mounted on said frame, an extensible member vcarried by said lifting member, av pawl `carried by said lifting member and engageable with said extensible member for adjus-tably supporting said extensible member', a lever pivoted to said frame and engageable with said pawl, and means secured to said lever and engageable with said framev for guiding said lever in its movement on said frame.

6. A lifting jack comprising a plurality of longitudinally extending frame'V members, lifting and extension mechanism` positioned between said members, a pair of carrying wheels supporting the rear end of said frame, caster brackets secured to the outside of said frame members, caster wheels mounted in said caster brackets for supporting the forward end of said frame, levers pivoted to said cas-ter brackets for adjusting said extension mechanism, and means for securing said caster brackets to said frame and forming the pivots for said levers.

7. Av lifting jaek comprising a plurality of lonfritudinally extending frame members, lift-ing and extension mechanism slidably positioned between said members, supporting wheels for the rear end of said lifting j ack, caster brackets secured to the outside of said frameV members, caster wheels mounted in said brackets for supporting the forward end of said jack, levers for adjusting the said extension meehanism, and bolts for securing said caster brackets to said frame 'and forming the pivots for said levers.

In testimony whereof we have signed our names to this specification, on this 19th day of June, A. D. 1923.

' LESTER PERKINS.

ANDREV J. PERKINS; 

